The subordinating conjunction ли means "if" or "whether", e.g. Sam didn't say if/whether he would come. However, the Russian conjunction is a clitic, which means it does not have an accent and therefore must attach itself to a word that does have accent. For this reason, ли is always in the second position of the clause it marks, rather than in first position like other conjunctions. Moreover, the subordinate clause it introduces requires inverted word order; that is, the verb must be moved to the beginning of the subordinate clause and ли is attached to the end of it. All other words in the sentence remain in their normal positions.

The problem is that Russian has another conjunction meaning "if": если. The question then is, when do you use ли and when do you use если? Remember this:

The Russian 'If' Rule

If in English you may use whether, in Russian you must use ли. Otherwise, use если

The same rule applies to the more dated variant of если, коли "if" and the semantic variant раз "once", e. g. Раз он придёт, мы будем веселиться Once he arrives, we'll have fun.

Here are a few examples to enjoy. Read them over carefully, comparing them with the translations and noting both the selection of ли and если and the word order of sentences containing the former.

In the following exercises, choose the Russian sentence most closely expressing the sentiment of the English sentence above by clicking the corresponding radio button. If you choose the wrong sentence, the explanation box will tell you exactly what your mistake is, so that you may quickly correct it.

1. How do you say "I don't know if he will come," in Russian?

Я не знаю, если он придёт.

Я не знаю, придёт ли он.

Я не знаю, ли он придёт.

Я не знаю, он ли придёт.

2. How do you say, "He will come, if I ask him," in Russian?

Он придёт, если я его попрошу.

Он придёт, я ли попрошу его.

Он придёт, попрошу ли я.

3. How do you say, "If he passes the test, I'll be surprised," in Russian?

Сдаст ли он экзамен, я удивлюсь.

Если он сдаст экзамен, я удивлюсь.

Ли он сдаст экзамен, я удивлюсь.

4. How do you say, "I don't remember if Volodya cooks well," in Russian?

Я не помню, Володя ли готовит хорошо..

Я не помню, ли Володя готовит хорошо.

Я не помню, если Володя хорошо готовит.

Я не помню, готовит ли Володя хорошо.

5. How would you say, "Do you know if the store is open on Sundays?" in Russian.